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A method and system for equalizing and synchronizing multi-channel sub-band signals

A technology with signals and signals, applied in the field of signal processing, which can solve the problems of phase inconsistency, main lobe broadening, and increased side lobe level of pulse compressed signals.

Active Publication Date: 2018-09-11
BEIJING INST OF RADIO MEASUREMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a multi-channel sub-band signal equalization, synchronization method and system thereof, which solves the problem that each sub-band signal passes through different receiving and sampling sub-channels in the bandwidth synthesis method of synthetic aperture radar imaging. , the problems of in-band amplitude fluctuation, phase inconsistency and system delay are generated, and then the problem of side lobe level increase and main lobe broadening of pulse compression signal after sub-band synthesis is solved

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  • A method and system for equalizing and synchronizing multi-channel sub-band signals
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  • A method and system for equalizing and synchronizing multi-channel sub-band signals

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Embodiment Construction

[0057]The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention. Such as figure 1 Its concrete practice and implementation steps are shown as follows:

[0058] The calculation formula steps involved in the equalization and synchronization method of a multi-channel sub-band signal are as follows:

[0059] The first step: Let the internal calibration signal of the test pass through each receiving and sampling sub-channel

[0060] Assuming that the internal calibration signal s(t) of the test is a standard chirp signal, the sub-band signal after the kth receiving and sampling sub-channel (let the delay of the sampled signal be 0) is:

[0061] the s k (t)=s(t)*h k (t) (1)

[0062] in, is the impulse response function of the kth receiving and sampling subchannel, α k is the ampl...

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Abstract

The invention discloses a multichannel sub-band signal equalization and synchronization method and system. Inner calibration signals to be tested are enabled to pass through all receiving and sampling sub-channels, system functions of all receiving and sampling sub-channels are calculated, frequency domain matching filters of all the receiving and sampling sub-channels are calculated, normally working echo signals are enabled to pass through all the receiving and sampling sub-channels, and all sub-band signals are subjected to frequency domain matching filtering operation. Thus multichannel sub-band signals can be subjected to equalization and synchronization operation. The multichannel sub-band signal equalization and synchronization method can help solve problems of fluctuating in-band amplitude, phase position consistency and system time delay that are caused after all the sub-band signals pass through different receiving and sampling sub-channels, and problems of a rising side lobe level and main lobe expansion of a pulse compression signal after sub-band combination can be further solved.

Description

technical field [0001] The present invention relates to the technical field of signal processing, more specifically, a multi-channel sub-band signal equalization and synchronization method and system thereof. Background technique [0002] Channel equalization is an extremely important link to improve communication system performance and improve communication quality. The channel equalization technology can effectively eliminate the impact of intersymbol interference (ISI). Since Lucky put forward the idea of ​​adaptive algorithm, many scholars have conducted in-depth and systematic research on adaptive algorithm and achieved many research results. In particular, the least mean square error (LMS) algorithm proposed by Widrow et al. has become a classic algorithm and a benchmark for measuring the pros and cons of other adaptive algorithms. The LMS algorithm is widely used in various fields such as channel equalization because of its simple algorithm and easy implementation. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9004
Inventor 刘忠伟刘京孙晗伟寇秀丽
Owner BEIJING INST OF RADIO MEASUREMENT